Rotate bits function

rotateBits.as

//TODO
function rotateBits(values:uint, extent:int):uint{
	var offset:uint;
	const bytesAll:int = 32;
	if(extent == 0){
		return values;
	}
	extent = extent % bytesAll;
	if(extent > 0){
		offset = values >>> (32 - extent);
		values = offset | (values << extent);
	}
	else{
		extent  = -extent;
		offset = values << (32 - extent);
		values = offset | (values >> extent);
	}
	return values;
}
trace(this.rotate(1, -1));
trace(this.rotate(2147483648, 2));
trace(this.rotate(2, 2));
trace(this.rotate(8, 1));

//http://www.tongwenguan.com/?p=1885 
//I read this tutorial, and try it in ActionScript